<?php  if ( ! defined('BASEPATH')) exit('No direct script access allowed');
/**
 * CodeIgniter
 *
 * An open source application development framework for PHP 4.3.2 or newer
 *
 * @package		CodeIgniter
 * @author		ExpressionEngine Dev Team
 * @copyright	Copyright (c) 2008 - 2009, EllisLab, Inc.
 * @license		http://codeigniter.com/user_guide/license.html
 * @link		http://codeigniter.com
 * @since		Version 1.0
 * @filesource
 */

// ------------------------------------------------------------------------

/**
 * Pagination Class
 *
 * @package		CodeIgniter
 * @subpackage	Libraries
 * @category	Pagination
 * @author		ExpressionEngine Dev Team
 * @link		http://codeigniter.com/user_guide/libraries/pagination.html
 */
class CI_Pagination {

  var $base_url			= ''; // The page we are linking to
  var $total_rows  		= ''; // Total number of items (database results)
  var $per_page	 		= 10; // Max number of items you want shown per page
  var $num_links			=  2; // Number of "digit" links to show before/after the currently viewed page
  var $cur_page	 		=  0; // The current page being viewed
  var $first_link   		= '&lsaquo; First';
  var $next_link			= '&gt;';
  var $prev_link			= '&lt;';
  var $last_link			= 'Last &rsaquo;';
  var $uri_segment		= 3;
  var $full_tag_open		= '';
  var $full_tag_close		= '';
  var $first_tag_open		= '';
  var $first_tag_close	= '&nbsp;';
  var $last_tag_open		= '&nbsp;';
  var $last_tag_close		= '';
  var $cur_tag_open		= '&nbsp;<strong>';
  var $cur_tag_close		= '</strong>';
  var $next_tag_open		= '&nbsp;';
  var $next_tag_close		= '&nbsp;';
  var $prev_tag_open		= '&nbsp;';
  var $prev_tag_close		= '';
  var $num_tag_open		= '&nbsp;';
  var $num_tag_close		= '';
  var $page_query_string	= FALSE;
  var $query_string_segment = 'per_page';

  /**
   * Constructor
   *
   * @access	public
   * @param	array	initialization parameters
   */
  function CI_Pagination($params = array()) {
    if (count($params) > 0) {
      $this->initialize($params);
    }

    log_message('debug', "Pagination Class Initialized");
  }

  // --------------------------------------------------------------------

  /**
   * Initialize Preferences
   *
   * @access	public
   * @param	array	initialization parameters
   * @return	void
   */
  function initialize($params = array()) {
    if (count($params) > 0) {
      foreach ($params as $key => $val) {
        if (isset($this->$key)) {
          $this->$key = $val;
        }
      }
    }
  }

  // --------------------------------------------------------------------

  /**
   * Generate the pagination links
   *
   * @access	public
   * @return	string
   */
  function create_links() {
  // If our item count or per-page total is zero there is no need to continue.
    if ($this->total_rows == 0 OR $this->per_page == 0) {
      return '';
    }

    // Calculate the total number of pages
    $num_pages = ceil($this->total_rows / $this->per_page);

    // Is there only one page? Hm... nothing more to do here then.
    if ($num_pages == 1) {
      return '';
    }

    // Determine the current page number.
    $CI =& get_instance();

    if ($CI->config->item('enable_query_strings') === TRUE OR $this->page_query_string === TRUE) {
      if ($CI->input->get($this->query_string_segment) != 0) {
        $this->cur_page = $CI->input->get($this->query_string_segment);

        // Prep the current page - no funny business!
        $this->cur_page = (int) $this->cur_page;
      }
    }
    else {
      if ($CI->uri->segment($this->uri_segment) != 0) {
        $this->cur_page = $CI->uri->segment($this->uri_segment);

        // Prep the current page - no funny business!
        $this->cur_page = (int) $this->cur_page;
      }
    }

    $this->num_links = (int)$this->num_links;

    if ($this->num_links < 1) {
      show_error('Your number of links must be a positive number.');
    }

    if ( ! is_numeric($this->cur_page)) {
      $this->cur_page = 0;
    }

    // Is the page number beyond the result range?
    // If so we show the last page
    if ($this->cur_page > $this->total_rows) {
      $this->cur_page = ($num_pages - 1) * $this->per_page;
    }

    $uri_page_number = $this->cur_page;
    $this->cur_page = floor(($this->cur_page/$this->per_page) + 1);

    // Calculate the start and end numbers. These determine
    // which number to start and end the digit links with
    $start = (($this->cur_page - $this->num_links) > 0) ? $this->cur_page - ($this->num_links - 1) : 1;
    $end   = (($this->cur_page + $this->num_links) < $num_pages) ? $this->cur_page + $this->num_links : $num_pages;

    // Is pagination being used over GET or POST?  If get, add a per_page query
    // string. If post, add a trailing slash to the base URL if needed
    if ($CI->config->item('enable_query_strings') === TRUE OR $this->page_query_string === TRUE) {
      $this->base_url = rtrim($this->base_url).'&amp;'.$this->query_string_segment.'=';
    }
    else {
      $this->base_url = rtrim($this->base_url, '/') .'/';
    }

    // And here we go...
    $output = '';

    // Render the "First" link
    if  ($this->cur_page > ($this->num_links + 1)) {
      $output .= $this->first_tag_open.'<a href="'.$this->base_url.'">'.$this->first_link.'</a>'.$this->first_tag_close;
    }

    // Render the "previous" link
    if  ($this->cur_page != 1) {
      $i = $uri_page_number - $this->per_page;
      if ($i == 0) $i = '';
      $output .= $this->prev_tag_open.'<a href="'.$this->base_url.$i.'">'.$this->prev_link.'</a>'.$this->prev_tag_close;
    }

    // Write the digit links
    for ($loop = $start -1; $loop <= $end; $loop++) {
      $i = ($loop * $this->per_page) - $this->per_page;

      if ($i >= 0) {
        if ($this->cur_page == $loop) {
          $output .= $this->cur_tag_open.$loop.$this->cur_tag_close; // Current page
        }
        else {
          $n = ($i == 0) ? '' : $i;
          $output .= $this->num_tag_open.'<a href="'.$this->base_url.$n.'">'.$loop.'</a>'.$this->num_tag_close;
        }
      }
    }

    // Render the "next" link
    if ($this->cur_page < $num_pages) {
      $output .= $this->next_tag_open.'<a href="'.$this->base_url.($this->cur_page * $this->per_page).'">'.$this->next_link.'</a>'.$this->next_tag_close;
    }

    // Render the "Last" link
    if (($this->cur_page + $this->num_links) < $num_pages) {
      $i = (($num_pages * $this->per_page) - $this->per_page);
      $output .= $this->last_tag_open.'<a href="'.$this->base_url.$i.'">'.$this->last_link.'</a>'.$this->last_tag_close;
    }

    // Kill double slashes.  Note: Sometimes we can end up with a double slash
    // in the penultimate link so we'll kill all double slashes.
    $output = preg_replace("#([^:])//+#", "\\1/", $output);

    // Add the wrapper HTML if exists
    $output = $this->full_tag_open.$output.$this->full_tag_close;

    return $output;
  }
}
// END Pagination Class

/* End of file Pagination.php */
/* Location: ./system/libraries/Pagination.php */